COMBINA

Number of combinations[1], including repetitions.

Syntax:

COMBINA( n:Integer, m:Integer )

This function yields the number of combinations of n unlike things taken m at a time, but allowing for repetitions.

Formula:

COMBINA = (n + m − 1)!  ∕  ((n − 1)! × m!)

Revisions:

This function was added in 2.00.

  1. Weisstein, Eric W. "Combination." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Combination.html